package main

import (
	"fmt"
)

type test struct {
}

func main() {
	mp := make(map[uint32][]uint32)

	mp[1] = nil
	mp[2] = nil
	mp[3] = nil

	if _, exist := mp[1]; exist {
		//	fmt.Printf("mp[1] exist, %v", mp)
		fmt.Printf("mp[1] exist")
	}
}
